Compilare: user.cpp: In function 'int main()': user.cpp:49: warning: unused variable 'x' user.cpp:49: warning: unused variable 'y' user.cpp:51: warning: unused variable 'rad' user.cpp:51: warning: 'x2' may be used uninitialized in this function user.cpp:51: warning: 'x1' may be used uninitialized in this function user.cpp:51: warning: 'y2' may be used uninitialized in this function user.cpp:51: warning: 'y1' may be used uninitialized in this function